Setu ATA2LL can propagate the call release on the FXS in the form of CPC signal. The device senses this signal and frees the FXS port.  An FXS port can be programmed for any of the three CLIP protocols - DTMF, FSK ITU-T V.23 and FSK Bellcore 202.

The product provides a list of programmable numbers or part numbers with economical SIP account. This port can be used to dial emergency numbers and during unavailability of the Internet or power failures.

Call arriving from a SIP account can be routed to either one or both FXS ports. Matrix Setu ATA2LL supports PPPoE client and hence can be used with xDSL modems.  Dynamic allocation of SIP account is also possible using dial plan.